PIEZO SPEAKER FOR IMPROVED PASSENGER CABIN AUDIO SYSTEMS

摘要

This invention outlines several applications of piezoelectric vibrators (4) to produce quality flat panel speakers in passenger cabin applications. A syste m consisting of an audio amplifier (2) and transformer (3) is used to drive th e piezo speaker (4). The electronics are packaged (8) so that they fit in smal l modules that can be attached to a cabin structure to produce a speaker. The invention includes a variety of flat panel speaker designs, including one in which the existing structure is converted into a speaker, and thin membrane and/or panels that are fitted with piezoelectric elements (Figures 5 and 6). A system consisting of cabin quieting and flat panel speakers is also discusse d where the mid and high frequency audio is produced by panel speakers (74-79) and the low frequency audio is produced from dynamic loudspeakers (80-84). T he cabin systems discussed in this patent are applicable to automobiles, aircraft, trucks and buses.